US4838261A - Gas metering arrangement - Google Patents

Gas metering arrangement Download PDF

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Publication number
US4838261A
US4838261A US07/167,131 US16713188A US4838261A US 4838261 A US4838261 A US 4838261A US 16713188 A US16713188 A US 16713188A US 4838261 A US4838261 A US 4838261A
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US
United States
Prior art keywords
chamber
expansion
measuring
gas
conduit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/167,131
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English (en)
Inventor
Tronje von dem Hagen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Draegerwerk AG and Co KGaA
Original Assignee
Draegerwerk AG and Co KGaA
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Assigned to DRAGERWERK AKTIENGESELLSCHAFT, A CORPORATION OF THE FEDERAL REPUBLIC OF GERMANY reassignment DRAGERWERK AKTIENGESELLSCHAFT, A CORPORATION OF THE FEDERAL REPUBLIC OF GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: VON DEM HAGEN, TRONJE
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
    • G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means
    • G05D16/2026—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means
    • G05D16/2046—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means the plurality of throttling means being arranged for the control of a single pressure from a plurality of converging pressures
    • G05D16/2053—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means with a plurality of throttling means the plurality of throttling means being arranged for the control of a single pressure from a plurality of converging pressures the plurality of throttling means comprising only a first throttling means acting on a higher pressure and a second throttling means acting on a lower pressure, e.g. the atmosphere

Definitions

  • the invention relates to a gas metering arrangement which is especially applicable to medical apparatus.
  • the change-over valve ahead of the measuring chamber is always switched with the cycle frequency when metering smaller quantities as well as when metering larger quantities with the expansion chamber being switched in.
  • This imposes extreme requirements with reference to the following: lower pass-through resistances, shorter switching times and thereby possibly higher cycle frequencies as well as a longer service life.
  • the change-over valve must at the same time provide corresponding flow characteristics for low metering quantities at low flow speeds as well as large metering quantities at higher flow speeds. These requirements are difficult to realize in a single component.
  • the advantages of the invention are essentially that the expansion valve can remain in its first position when low gas flows are metered and that only the measuring-chamber change-over valve is switched into its first position for filling the measuring chamber and is switched into its second position for discharging the measuring chamber in accordance with the adjusted switching cycle.
  • the expansion chamber is then continuously connected to the gas supply and serves as an additional buffering chamber.
  • the measuring chamber change-over valve remains continuously in its first position for metering larger gas quantities at higher flow velocities so that in this case, the measuring chamber as well as the expansion chamber are filled and both are discharged into the output line via the expansion valve switched into its second position.
  • the metering unit 3 is supplied with gas from a gas source 1 via a pressure reducer 2 and a line 24 and delivers metered gas to a consumer (not illustrated) via an outlet 4.
  • a control unit 5 controls the metering unit 3 on the basis of signals which it receives from the metering unit 3 and the desired-value input 6. The adjusted values and possible disturbances are indicated on a display 7.
  • an input buffer 8 is connected with the pressure reducer 2 via a tubular line 24 and a pressure chamber 10 is connected with the input buffer 8 via a throttle 9.
  • the input buffer 8 further includes a connecting line to the input of an expansion valve 20 which is shown in its first switching position. In this first switching position, the input buffer 8 is connected with an expansion chamber 19 via a tubular line 21.
  • the output of the expansion valve 20 is connected to a blocking valve 15 via a diverting line 14.
  • the tubular line 21 is connected to the input of the measuring-chamber valve 11 and the diverting line 14 is connected to the output of the measuring-chamber valve 11.
  • the input of the valve 11 is connected with the measuring chamber 13 when the measuring-chamber valve 11 is in its first position as shown.
  • the pressure chamber 10 as well as the measuring chamber 13 have connecting lines to a differential pressure sensor 18 which delivers a voltage signal to the control unit 5.
  • the blocking valve 15 is blocked in its first position as shown and a consumer line 25 leads to an output buffer 16 at the downstream end of the valve 15.
  • the output buffer 16 opens to the outlet 4 via an output throttle 17.
  • the control unit 5 receives the signal from the differential-pressure sensor 18 as well as a temperature value measured by the temperature sensor 22.
  • the temperature sensor 22 is mounted in the input buffer 8 and measures the input temperature of the gas to be metered. For corresponding temperature variations, the temperature sensor 22 delivers a correction possibility for the metered quantity to the control unit 5.
  • the pressure chamber 10, expansion chamber 19 and measuring chamber 13, which are all initially empty, are filled from the gas source 1 with a feed pressure via the input buffer 8.
  • the expansion valve 20 and the measuring-chamber valve 11 are in their respective first positions shown in the drawing.
  • a predetermined pressure difference between the pressure chamber 10 and the measuring chamber 13 is measured by the difference-pressure sensor 18.
  • the throttle 9 prevents the pressure in the pressure chamber 10 from temporarily falling below the operating pressure with the filling surge of the measuring chamber 13 and then prevents that by means of the pressure-differential sensor 18 the desired difference is determined at too low a pressure and so prevents a switch-over from being initiated.
  • the expansion valve 20 switches into its second position so that the content of the expansion chamber 19 and of the measuring chamber 13 is present in the diverting line 14 ahead of the blocking valve 15 which is still in its first (blocking) position as shown in the drawing.
  • the blocking valve 15 too is then switched to its second position and the expansion chamber 19 and the measuring chamber 13 can empty via the output buffer 16. Large gas quantities to be metered and high flow velocities are then not deleterious to a precise metering.
  • the measuring-chamber valve 11 is switched into its second position when the filling pressure is reached whereby only the volume of the measuring chamber 13 is present ahead of the blocking valve 15 which is still in its first (blocked) position.
  • the content of the measuring chamber 13 can discharge via the consumer line 25 to the output 4 after the blocking valve 15 switches into its second position.
  • the blocking valve 15 and, after a predetermined delay time, also the measuring valve 11, are again switched back into their respective first positions and the filling operation can begin anew.
  • the predetermined pressure value to which the pressure in the measuring chamber 13 drops is measured by the pressure-difference sensor 18 and delivered to the control unit 5.
  • the variations in the switching times of the valves are controllable independently of each other.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Measuring Volume Flow (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
US07/167,131 1987-03-12 1988-03-11 Gas metering arrangement Expired - Fee Related US4838261A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3707942 1987-03-12
DE19873707942 DE3707942A1 (de) 1987-03-12 1987-03-12 Gasdosiervorrichtung, insbesondere fuer medizinische apparate

Publications (1)

Publication Number Publication Date
US4838261A true US4838261A (en) 1989-06-13

Family

ID=6322852

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/167,131 Expired - Fee Related US4838261A (en) 1987-03-12 1988-03-11 Gas metering arrangement

Country Status (6)

Country Link
US (1) US4838261A (de)
EP (1) EP0281937B1 (de)
JP (1) JPH0672792B2 (de)
BR (1) BR8801086A (de)
DE (2) DE3707942A1 (de)
ES (1) ES2018058B3 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5720276A (en) * 1994-10-25 1998-02-24 Teijin Limited Apparatus for supplying a respiratory gas to a patient
US20040079359A1 (en) * 2002-10-24 2004-04-29 Aylsworth Alonzo C. Method and system for delivery of therapeutic gas to a patient and for filling a cylinder
US20060157058A1 (en) * 2005-01-18 2006-07-20 Acoba, Llc Trans-fill method and system
US20070161940A1 (en) * 2005-12-02 2007-07-12 Blanchard Daniel B Pressure activated proximal valves
US20070214960A1 (en) * 2006-03-16 2007-09-20 Acoba, L.L.C. Method and system of operating a trans-fill device
US20070214955A1 (en) * 2006-03-16 2007-09-20 Acoba, L.L.C. Method and system of coordinating an intensifier and sieve beds
WO2011060204A2 (en) 2009-11-11 2011-05-19 The Board Of Trustees Of The Leland Stanford Jr. University Ventilation systems and methods

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4006905A1 (de) * 1990-03-06 1991-09-12 Hydac Technology Gmbh Verfahren zur feststellung der gasvorspannung bei hydrospeichern und zum einhalten eines druck-sollwertes der gasvorlage waehrend des betriebes

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4651730A (en) * 1983-12-16 1987-03-24 Dragerwerk Ag Gas metering device for medical apparatus

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1842511U (de) * 1961-07-31 1961-11-30 Balzers Vakuum G M B H Gas-dosierungs- und eichvorrichtung, insbesondere fuer kleine gasquanten.
GB1110929A (en) * 1966-04-12 1968-04-24 Fiat Spa Flowmeter,more particularly for liquids
NL130964C (de) * 1966-10-24
GB1357334A (en) * 1970-07-21 1974-06-19 British Oxygen Co Ltd Lung ventilators
CA1020418A (en) * 1974-02-13 1977-11-08 Dresser Industries Periodically actuated pneumatic ratemeter
IT1036193B (it) * 1974-06-07 1979-10-30 Bio Med Devices Inc Respiratore pediatrico
US4060078A (en) * 1975-08-18 1977-11-29 Bird F M Ventilator and method
DD139923A3 (de) * 1976-11-25 1980-01-30 Klaus Jehmlich Vorrichtung zur dosierung gasfoermiger oder fluessiger medien,vorzugsweise solcher fuer selbsttaetige atemgeraete,insbesondere fuer anaesthesie,reanimation und therapie
US4328823A (en) * 1980-05-14 1982-05-11 N.A.D. Inc. Oxygen flow ratio controller for anesthesia apparatus
DE3229328C2 (de) * 1982-08-06 1984-08-02 Drägerwerk AG, 2400 Lübeck Gasdosiervorrichtung für medizinische Apparate
DE3310858A1 (de) * 1983-03-25 1984-09-27 Drägerwerk AG, 2400 Lübeck Gasdosiervorrichtung fuer anaesthesiegeraete
DE3409985C2 (de) * 1984-03-19 1986-07-17 Bertram Prof. Dr. Frisch Verfahren und Vorrichtung zum Bestimmen physikalischer Eigenschaften einer porösen Materialprobe, insbesondere der spezifischen Oberfläche
DE3422066A1 (de) * 1984-06-14 1985-12-19 Drägerwerk AG, 2400 Lübeck Beatmungssystem und steuerbare ventileinheit hierzu
DE3630078A1 (de) * 1986-09-04 1988-03-17 Kruse Hans Hinrich Dipl Chem Vorrichtung zur transformation von gasmengen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4651730A (en) * 1983-12-16 1987-03-24 Dragerwerk Ag Gas metering device for medical apparatus

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5720276A (en) * 1994-10-25 1998-02-24 Teijin Limited Apparatus for supplying a respiratory gas to a patient
US20040079359A1 (en) * 2002-10-24 2004-04-29 Aylsworth Alonzo C. Method and system for delivery of therapeutic gas to a patient and for filling a cylinder
US6904913B2 (en) * 2002-10-24 2005-06-14 Acoba, Llc Method and system for delivery of therapeutic gas to a patient and for filling a cylinder
US7900627B2 (en) 2005-01-18 2011-03-08 Respironics, Inc. Trans-fill method and system
US20060157058A1 (en) * 2005-01-18 2006-07-20 Acoba, Llc Trans-fill method and system
US8875707B2 (en) 2005-01-18 2014-11-04 Respironics, Inc. Trans-fill method and system
US20070161940A1 (en) * 2005-12-02 2007-07-12 Blanchard Daniel B Pressure activated proximal valves
US11305102B2 (en) 2005-12-02 2022-04-19 C. R. Bard, Inc. Pressure activated proximal valves
US9943678B2 (en) 2005-12-02 2018-04-17 C. R. Bard, Inc. Pressure activated proximal valves
US9044541B2 (en) 2005-12-02 2015-06-02 C. R. Bard, Inc. Pressure activated proximal valves
US20090071330A1 (en) * 2006-03-16 2009-03-19 Koninklijke Philips Electronics, N.V. Method and system of operating a trans-fill device
US7972414B2 (en) 2006-03-16 2011-07-05 Koninklijke Philips Electronics N.V. Method and system of operating a trans-fill device
US7556670B2 (en) 2006-03-16 2009-07-07 Aylsworth Alonzo C Method and system of coordinating an intensifier and sieve beds
US7459008B2 (en) 2006-03-16 2008-12-02 Aylsworth Alonzo C Method and system of operating a trans-fill device
US20070214955A1 (en) * 2006-03-16 2007-09-20 Acoba, L.L.C. Method and system of coordinating an intensifier and sieve beds
US20070214960A1 (en) * 2006-03-16 2007-09-20 Acoba, L.L.C. Method and system of operating a trans-fill device
WO2011060204A2 (en) 2009-11-11 2011-05-19 The Board Of Trustees Of The Leland Stanford Jr. University Ventilation systems and methods
EP2498849A4 (de) * 2009-11-11 2015-07-08 Univ Leland Stanford Junior Entlüftungssysteme und -verfahren
US9707371B2 (en) 2009-11-11 2017-07-18 The Board Of Trustees Of The Leland Stanford, Jr. University Ventilation systems and methods

Also Published As

Publication number Publication date
ES2018058B3 (es) 1991-03-16
BR8801086A (pt) 1988-10-18
DE3707942A1 (de) 1988-09-22
DE3860622D1 (de) 1990-10-25
EP0281937B1 (de) 1990-09-19
JPH0672792B2 (ja) 1994-09-14
EP0281937A1 (de) 1988-09-14
JPS63249020A (ja) 1988-10-17

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Owner name: DRAGERWERK AKTIENGESELLSCHAFT, MOISLINGER ALLEE 53

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Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362